package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.DishDTO;
import com.sky.dto.DishPageQueryDTO;
import com.sky.entity.Dish;
import com.sky.entity.DishFlavor;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.mapper.DishFlavorMapper;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealDishMapper;
import com.sky.result.PageResult;
import com.sky.result.Result;
import com.sky.service.DishService;
import com.sky.vo.DishVO;
import io.swagger.annotations.ApiOperation;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.web.bind.annotation.GetMapping;

import java.util.ArrayList;
import java.util.List;

@Service
@Slf4j
public class DishServiceImpl implements DishService {
    /**
     * 新增菜品和对应的口味
     * @param dishDTO
     */
    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private DishFlavorMapper dishFlavorMapper;
    @Autowired
    private SetmealDishMapper setmealDishMapper;
    //@Override 标记当前方法是重写（覆盖）了父类中的方法,不是必须的
    @Override
    //作用:涉及多表，保证所有表都操作成功,将当前方法交给spring进行事务管理，方法执行前，
    // 开启事务;成功执行完毕，提交事务;出现异常，回滚事务，springboot自带，spring需要注解
    @Transactional
    public void saveWithFlavor(DishDTO dishDTO) {
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO,dish);
        //向菜品表插入1条数据
        dishMapper.insert(dish);


        //通过xml中sql语句配置，sql语句执行后，返回主键值
        //获取insert语句生成的主键值
        Long dishId = dish.getId();

        List<DishFlavor> flavors = dishDTO.getFlavors();
        //判断是否添加了口味数据
        if(flavors != null && flavors.size() > 0){
            //遍历给添加的口味数据设置菜品id，赋值给dishId
            flavors.forEach(dishFlavor ->{
                    dishFlavor.setDishId(dishId);
            });
            //批量插入  //向口味表插入n条数据
            dishFlavorMapper.insertBatch(flavors);

        }
    }
    /**
     * 菜品分页查询
     * @param dishPageQueryDTO
     * @return
     */
    @Override
    public PageResult pageQuery(DishPageQueryDTO dishPageQueryDTO) {
        PageHelper.startPage(dishPageQueryDTO.getPage(),dishPageQueryDTO.getPageSize());
        Page<DishVO> page = dishMapper.pageQuery(dishPageQueryDTO);
        return new PageResult(page.getTotal(),page.getResult());

    }

    /**
     * 菜品批量删除
     * 具体业务
     * @param ids
     */
    @Transactional
    @Override
    public void deleteBatch(List<Long> ids) {
        //判断当前菜品是否能够删除---是否存在起售中的菜品
        for (Long id : ids){
            Dish dish = dishMapper.getById(id);
            if(dish.getStatus() == StatusConstant.ENABLE){
                //当前菜品处于起售中，不能删除
                throw new DeletionNotAllowedException(MessageConstant.DISH_ON_SALE);
            }
        }
        //判断当前菜品是否能够删除---是否存在关联的套餐
        List<Long> setmealIds = setmealDishMapper.getSetmealIdsByDishIds(ids);
        if(setmealIds != null && setmealIds.size() > 0){
            //当前菜品有关联的套餐，不能删除
            throw new DeletionNotAllowedException(MessageConstant.DISH_BE_RELATED_BY_SETMEAL);
        }
//        //，如果删除的菜品数量很多，遍历的sql语句太多了
//        //删除菜品表中的菜品数据
//        for (Long id : ids){
//            dishMapper.deleteById(id);
//            //删除菜品关联的口味数据
//            dishFlavorMapper.deleteByDishId(id);
//        }
        //优化代码，只有两条固定的sql语句
        //根据菜品id集合批量删除菜品数据
        //sql：delete from dish where id in (?,?,?)
        dishMapper.deleteByIds(ids);
        //根据菜品id集合批量删除关联的口味数据
        //sql：delete from dish_flavor where dish_id in (?,?,?)
        dishFlavorMapper.deleteByDishIds(ids);
    }
/**
 * 根据id查询菜品和对应的口味数据
 * @param id
 * @return
 */
    @Override
    public DishVO getByIdWithFlavor(Long id) {
        //根据id查询菜品数据
        Dish dish = dishMapper.getById(id);
        //根据菜品id查询口味数据
        List<DishFlavor> dishFlavors = dishFlavorMapper.getByDishId(id);
        //将查询到的数据封装到DishVO中
        DishVO dishVO = new DishVO();
        BeanUtils.copyProperties(dish,dishVO);
        dishVO.setFlavors(dishFlavors);
        return dishVO;
    }
/**
 * 根据id修改菜品基本信息和对应的口味信息
 * @param dishDTO
 */
    @Override
    public void updateWithFlavor(DishDTO dishDTO) {
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO,dish);
        //修改菜品表基本信息数据
        dishMapper.update(dish);

        //删除原有的口味数据
        dishFlavorMapper.deleteByDishId(dishDTO.getId());

        //添加新的口味数据
        List<DishFlavor> flavors = dishDTO.getFlavors();
        if(flavors != null && flavors.size() > 0){
            //遍历给添加的口味数据设置菜品id，赋值给dishId
            flavors.forEach(dishFlavor ->{
                dishFlavor.setDishId(dishDTO.getId());
            });
            //批量插入
            //向口味表插入n条数据
            dishFlavorMapper.insertBatch(flavors);
        }
    }

    /**
     * 菜品起售停售
     * @param status
     * @param id
     */
    @Override
    public void startOrStop(Integer status, Long id) {
     // update dish set status = ? where id = ?
        Dish dish = Dish.builder()
                .status(status)
                .id(id)
                .build();
                dishMapper.update(dish);
    }

    /**
     * 根据分类id查询菜品
     * @param categoryId
     * @return
     */

    @Override
    public List<Dish> list(Long categoryId) {
        Dish dish = Dish.builder()
                .categoryId(categoryId)
                .status(StatusConstant.ENABLE)
                .build();
                return dishMapper.list(dish);


    }
    /**
     * 条件查询菜品和口味
     * @param dish
     * @return
     */
    public List<DishVO> listWithFlavor(Dish dish) {
        List<Dish> dishList = dishMapper.list(dish);

        List<DishVO> dishVOList = new ArrayList<>();

        for (Dish d : dishList) {
            DishVO dishVO = new DishVO();
            BeanUtils.copyProperties(d,dishVO);

            //根据菜品id查询对应的口味
            List<DishFlavor> flavors = dishFlavorMapper.getByDishId(d.getId());

            dishVO.setFlavors(flavors);
            dishVOList.add(dishVO);
        }

        return dishVOList;
    }





}
